Can-sealing closure



June 81. 1926.

c. A'. CQMP SEALING CLOSURE Filed April 14, 192:

2 Shqets-Sheefc 1.

g n wanker June. 8. 1926.

c. A. COMP CAN SEALING CLOSURE 2 Sheets-Shet 2 Patented June 8, 1926.

naireosrares PATENT easier..-

CHARLES A. COMP, OF DETROIT, MICHIGAN, ASSIGNCR TO BUHL STAMPINGGOMPANY,

or DETROIT, MICHIGAN, A CORPORATION or MICHIGAN.

CAN-SEALING CLOSURE.

Application filed April 14, 1923. "serial No. 632,039.

In the manufacture of milk containers, for-instance milk scans, the manufacturer subjects the can to an air test to discover any leakage in or about connections, joints or other parts of a. can. This test includes the mounting of a closure on the mouth of the can, the ejection of air, under pressure into the can, and then partial immersion of the can in-water so that air bubbles will indicate any leakage which can be repaired or the can discarded.

My invention aimsto provide a sealing closure that may be easily and quickly mounted upon a milk can to permit of it being tested by air pressure. The sealing closure includes a head provided with a yieldable sealing ring and shiftable jaws by which the head may be clamped on a can. Manual means is employed for shifting the jaws and holding said jaws in a shifted position so that there can be no accidental release of a can during an air test.

The construction of the sealing closure will be hereinafter specifically described and then claimed, and reference will now be had to the drawings, wherein Figure 1 is a diagrammatic view of an air testing apparatus for which the sealing closure has been especially designed;

Fig. 2 is a cross sectional View of a sealing closure; v

Fig. 3 is a plan of the same, partly in horizontal section, and

Fig. 1 is a perspective View of one of the clamping jaws.

In the drawing the reference numeral 1 denotes a circular head having a central vertically disposed boss 2 provided with an axial air passage 3 and the upper end of the passage 8 has its walls screwthreaded to receive the lower end of an air inlet pipe 4 which serves as a spindle for a purpose that will hereinafter appear. I v

The head 1 has a rim portion 5 provided with an annular undercut groove 6' for a sealing ring 7, said ring being made of rubber or a suitable yieldable or compressible material. The sealing ring 7 is held in the Igroove 6 by a retaining ring 8 con nected to the lower face of the head 1 by screws 9 or other fastening means, and said retaining ring is provided with a plurality of feet 10 by which the head may be guided immersed in the water 30.

and centered'when placed on a can or sup-- ported when not in actual use.

Rotatable on the boss 2 about the air inlet pipe 1 circular cam member 11' provided with a plurality of cam slots 12 for pins 13carr1ed bythe bifurcated inner ends 14; of arms 15 havlng jawslG. Tl 0 arms 15 are radially disposed between sets of upstanding guides 17 carried by the rim 5 of the head 1, said guides having transverse pins 18 extending through slots 19 in the arms 15. The outer ends of the arms 15 are curved downwardly with the inner edges of said arms provided with the jaws 16, said jaws being of greater width than the arms and slidable between sets of later ally extending guides 20 carried by the rim 5 of the head 1. The jaws 16 have segment shaped Fgripping surfaces 21 adapted to engage under the reinforced edge 22 of a can neck 23 while the sealing ring 7 englages an inclined wall 24 of said can use I.

The circular cam member 11 has a plurality of upstanding pins 25 and mounted over said pins and about the air inlet pipe 1 is a hub 26 of a'hand wheel 27 by which the cam member 11 may be conveniently adjusted. The wheel hub 26 is retained on the pins 25 by an air hose nipple 2S screwed on the upper end of the air inlet pipe 4. I

Reference will now be had to Fig. 1

showing a tank 29 containing water 30.

ciently compressed to insure a non-leakable air connection between the neck of the can and the sealing ring-7. Air is then admitted to the can and the greater part thereof Any air bubbles will indicate an imperfect joint, seam, imperfect connection or porous material.

The construction of the cam member 11 and the arrangement of the arms '15 is such that the friction between these elements will retain the jaws 16 in an adjusted position against the cam, and with the inclined faces of the jaws producing a downward pressure of the head 1 the, sealing ring? will be compressed against the can to insure a non-leakab-le connection. By loosening the retaining ring;8 the sealing ring 7 can be shifted from time to time to insure even wear, and while in the drawings there is illustrated a preiered embodiment of my invention, it is to be understood that the structural elements are susceptible to such changes as fall within the scope of the appended claims.

l Vhat I claim is:-

1. A sealing closure for milk containers adapted to be air tested for leaks, said clo sure comprising a head 'adaptedto extend into the neck of the milk container, a sealing ring clamped on said head and haying an exposed portion for compression against the wall of the milk container neck, jaws carried by said head and adapted to engage the pouring edge of the milk container and clamp the sealing ring and head on the milk container, and jaw shifting said air inlet pipe, armsslidable on said head and articulated with said cam member and adapted to be shlited by sa d cam member, and jaws carried by said arms in proximity to said sealing ring.

A sealing closure as called for in. claim 2, wherein said arms are radially disposed and said head has vertical and lateral guides for said arms. In testimony whereof I aiiiX my signature.

CHARLES A. COMP. 

